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All Forums >> RC Airplanes >> ARF or RTF >> RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 2/27/2012 9:28 AM   
norm


 

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Status: offline 		Gonzalo,

the saito 90 3 cylinder is really too weak of an engine to power this plane. In reality the "90" means nothing but the size of displacement and it is 3 "30's" fighting each other. there is a great loss of power and the engine is somehow comparable to a 45 - 4 stroke which i think would be even stronger.

I have the 3 cylinder Saito 90, the 450 and the 170, they all are great looking, "pieces of jewelry" good to look at, but wont deliver power. Too much mechanicc to move around in this size engine.

Normand

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/6/2012 12:29 PM   
raaf


 

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/6/2012 12:34 PM   
raaf


 

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Status: offline 		I AM GOB SMACKED I ACTULLY UPLOADED A PHOTO OF THE COCKPIT OF MY B25.ITS NEVER WORKED BEFORE SO ILL TAKE THIS ONE.ILL PUSH MY LUCK AND DO ACOUPLE MORE TOMORROW


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/6/2012 12:36 PM   
raaf


 

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Status: offline 		THAT PHOTO IS MK1 NEXT ONE IS I THINK BETTER.

RAAF


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/8/2012 11:51 AM   
raaf


 

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Status: offline 		hi guys.
Well the time has come for the maiden flight.ive done a series of grond runs and all is well i just hope i havnt missed anything.I've also put 3 tanks of fuel through each motor which i bought when the b25s came out [big mistake] after reading some of the suggestions on this thread.
The motors run sweetly and havnt flamed out during static testing so no excuses
AUW is 19lbs with all the bling even electric retracts, not to heavy i think.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/9/2012 2:04 AM   
agmurf


 

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quote:

ORIGINAL: raaf

hi guys.
Well the time has come for the maiden flight.ive done a series of grond runs and all is well i just hope i havnt missed anything.I've also put 3 tanks of fuel through each motor which i bought when the b25s came out [big mistake] after reading some of the suggestions on this thread.
The motors run sweetly and havnt flamed out during static testing so no excuses
AUW is 19lbs with all the bling even electric retracts, not to heavy i think.



Good luck and keep us posted.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/14/2012 8:10 PM   
Fidelity101


 

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Status: offline 		Can anyone with experience on this plane comment on whether a pair of thunder tiger 91 four stroke engines would be to much? I've got an offer for a package deal with those motors but I'm concerned the added 10 ounces per motor and larger size may cause issues in terms of fitting inside the canopy and causing me to add tail weight to an already heavy plane.

Also, has anyone compared the flight of this plane to the hangar 9 twin otter? The twotter can handle a single engine failure without a huge cause for panic, but other than that, I wonder if the feel of flight will be similar?

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/14/2012 8:40 PM   
cobi.p


 

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Status: offline 		I do not see any problem with these engines, you need only coordinate their installation ,that it all, I am flying with two engines RCV91-CD and it work wonderful , was a bit of work to match them but not something special, he flies very well on one engine to . i use 2 APC 3 blade 13/8

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/15/2012 2:17 AM   
Speedracer2112



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quote:

ORIGINAL: Fidelity101

Can anyone with experience on this plane comment on whether a pair of thunder tiger 91 four stroke engines would be to much? I've got an offer for a package deal with those motors but I'm concerned the added 10 ounces per motor and larger size may cause issues in terms of fitting inside the canopy and causing me to add tail weight to an already heavy plane.


The question is the total weight of the engine since we don't know what the reference engine is. 10 more ounces than what?

You really want a light plane. Nothing flys worse than a brick. It takes all the fun right out of it.


SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/15/2012 6:38 PM   
Fidelity101


 

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Status: offline 		http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAHTS&P=ML
This is my curret engine.

The extra 10 ounces was compared to a similar 72 size...but I agree that I need to compare it to the stock motor which is no longer sold. Here are the weight and measurements.

Thunder Tiger .91 FS
SPECS: Displacement: .91 cu in (14.97cc)
Bore: 1.114" (28.3mm)
Stroke: 0.937" (23.8mm)
Practical RPM: 1,800 - 12,000
Output: 1.6 HP @ 11,000 rpm
Weight: 26.20oz (742.8g) without muffler
Crankshaft Size: 5/16-24
Height from Mounting Tab Bottom to Top of Rocker Arm: 3.77" (95.7mm)
Height from Crankcase Bottom to Top of Rocker Arm: 4.63" (117.7mm)
Width at Mounting Tabs: 2.36" (60mm)
Width of Crankcase below Mounting Tabs: 1.69" (43mm)
Center of Mounting Holes Same Side: 0.98" (25mm)
Center of Mounting Holes Opposite Side: 2.05" (52mm)
Center of Crankcase to Drive Washer: 2.62" (66.5mm)
Distance from Backplate Screw to Drive Washer: 3.64" (92.5mm)

Stock recommendation: OS FL-70
- 1 cylinder
- Displacement: 0.699 cubic inches
- Bore: 1.091 (in.)
- Stroke In: 0.748 (in.)
- Low RPM: 2300
- High RPM: 12000
- 1.100 bhp @ 11000 RPM
- Weight (no muffler): 16.50 oz.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/15/2012 7:16 PM   
Mustang Fever



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Status: offline 		Fidelity:

Use em. Just break em in real good, make sure they both have a reliable idle (at least 3 minutes without loading up- this means adjusting the low end mixture), around 21-2300RPM (USE A TACH), make sure they both have a 1-200 rpm "bump" on a pinch test at WOT (USE A TACH) and make sure you're synchronized on the ground. Contrary to a lot of the info floating around, it is perfectly acceptable to get the final synch by leaning one engine slightly, but always pinch test at WOT afterward. (You also want to make sure the throttle servo linkages are as geometrically identical as you can.)

I used a pair of 55 2S, and I'm betting your 91 FS will put out about the same power or slightly more. The extra weight will help- I had to use Higley heavy brass prop nuts on mine to get the CG.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/15/2012 8:52 PM   
Speedracer2112



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Status: offline 		The things you should consider.

1. Do you love Thunder Tiger motors?
2. Are they ultra dependable?
3. Are they worth the extra weight?
4. You you want or need the extra HP?
5. Are they new?
6. Can you sell them and get what you want?

Don't use them just because they came with the plane. Go with what you know and like on a twin.

SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/19/2012 2:50 PM   
raaf


 

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Status: offline 		My 2 bobs worth.I got 2 of the 70s on mine and they work great.no trouble with idle no flame outs just reliabilty.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 3/19/2012 4:03 PM   
Fidelity101


 

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Status: offline 		Thanks for the information. The two 91s I have are the older style but brand new in box. I've heard they are very reliable but I think I'll run them for a while on te bench before making a decision.

I was also thinking of selling them (for sale on Rcgroups) but I'm not sure of the newer version is better or if parts are available for the older version I have. Mine goes not have anodized parts.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/5/2012 2:02 AM   
agmurf


 

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Status: offline 		I do not have the yoke posts and control yokes to put in place. Does anyone have what came with the kit they want to part with?

I found them hiding.

< Message edited by agmurf -- 4/15/2012 8:11 PM >

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/19/2012 11:34 PM   
JBoyd58


 

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Status: offline 		Does anyone have a spare used or new nose windscreen and chin set? (TOPA-1715). I dropped mine, broke it into pieces on the front.
I'll pay fair value, plus shipping cost to me! Thanks, J.B.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/20/2012 11:24 AM   
Speedracer2112



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quote:

ORIGINAL: JBoyd58

Does anyone have a spare used or new nose windscreen and chin set? (TOPA-1715). I dropped mine, broke it into pieces on the front.
I'll pay fair value, plus shipping cost to me! Thanks, J.B.



I think I do. Not positive. I'll be home in one week and I will look.

You can also check with Hobby Services. They are very nice a will send you parts from destroyed/damaged kits.

SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/20/2012 2:03 PM   
RCGuy41


 

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Status: offline 		JBoyd58,

Go to this site http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXTFT8&P=7 you can purchase the parts for $22.49 less shipping.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/20/2012 3:13 PM   
JBoyd58


 

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Status: offline 		I should have mentioned, I've been all over the internet. And this part is on back order until late May.
Including Tower Hobbies. I was looking, to maybe get one sooner through a post here and there.
Thanks anyway!

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/20/2012 3:19 PM   
norm


 

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Status: offline 		I have that, watch me brake mine now.... pm me

Normand

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 4/28/2012 3:03 PM   
Speedracer2112



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quote:

ORIGINAL: normandouellette

I have that, watch me brake mine now.... pm me

Normand


I have one also. If yours breaks I'll send you this one.

SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 5/1/2012 6:15 PM   
Speedracer2112



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Status: offline 		I'm going to Joe Nall with my TF B-25 and my ASM B-17. Anyone else going too ?


SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 5/2/2012 1:35 AM   
norm


 

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Status: offline 		thanx, kind of you but I'll pray the seson begins here!!

nORMAND

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/5/2012 1:59 PM   
Jyjkoz


 

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Status: offline 		I am going to satrt my build .... I purchased two os 95v for the plane . Has anyone used them in this plane yet? Will they be a good match for the B-25?

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/5/2012 9:18 PM   
rcnut101


 

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Status: offline 		95's will pull it just fine. I am fling with OS 70's and it flies scale. It does fly well on one engine.

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